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When I’m driving in the city, normal stop and go, my coolant temp sits right at the half way mark (210). When I get on the freeway however it jumps up anywhere from 10-15 degrees higher. Never overheats though.
I drove it daily about 140 miles round trip (all freeway). Mornings it seemed to be fine. Afternoons coming back it seemed to be running hotter (although not always).
I’m not understanding what the problem could be. It has had a coolant flush within a couple months. Radiator seems to be fine.

Check it with a scanner to make sure it's a problem. Thermostats and coolant sensors usually fail cooler (trucks ~195 degrees, reads 180, for example).
Look for proper coolant level, anything blocking the radiator (leaves), fan operation, etc.
Could be the stepper motor is going bad.

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